Photographing lens and photographing apparatus

Abstract

A photographing lens and a photographing apparatus including the same. The photographing lens includes a first lens having a positive refractive power or a negative refractive power and being meniscus shaped; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power and having a surface convex toward the image side; and a fifth lens having a negative refractive power, having a surface concave from the image side, and including at least one aspheric surface, wherein the first through fifth lenses are sequentially arranged from the object side toward the image side.

The invention claimed is: 
     
       1. A photographing lens comprising:
 a first lens having a positive refractive power or a negative refractive power and comprising a meniscus shape; 
 a second lens having a positive refractive power and being a meniscus lens having an image side surface convex toward an image side; 
 a third lens having a negative refractive power; 
 a fourth lens having a positive refractive power and having a surface convex toward the image side, the fourth lens being a biconvex lens; and 
 a fifth lens having a negative refractive power, having a surface concave away from the image side, and including at least one aspheric surface, 
 wherein the first through fifth lenses are sequentially arranged from an object side toward the image side, and 
 wherein the photographing lens satisfies:
   1.332 mm≤EFL≤1.777 mm
 
   3.0 mm≤APE- L 5-MAX<4.5 mm
 
   80 degrees<FoV<160 degrees 
   1.0<EFL/EPD<2.0 
   IND- L 5>1.6 
     Vd - L 5<30, 
 
 wherein IND-L5 denotes a refractive index of the fifth lens and Vd-L5 denotes an Abbe's number of the fifth lens, APE-L5-MAX denotes a diameter of a maximum effective aperture of the fifth lens, FoV denotes a field of view of the photographing lens, EFL denotes an effective focal length of the photographing lens, and EPD denotes a diameter of an entrance pupil of the photographing lens. 
 
     
     
       2. The photographing lens of  claim 1 , further comprising an iris arranged between the first lens and the third lens. 
     
     
       3. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
   | F 1|/EFL>1, 
 
       wherein F1 denotes a focal length of the first lens. 
     
     
       4. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
     F 2/EFL<5, 
 wherein F2 denotes a focal length of the second lens. 
 
     
     
       5. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
     T 3/ T 2<1 
 wherein T2 denotes thickness of the second lens along an optical axis, and 
 T3 denotes thickness of the third lens along the optical axis. 
 
     
     
       6. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
     Vd 3/ Vd 2<1, 
 wherein Vd2 denotes an Abbe's number of the second lens, and 
 Vd3 denotes an Abbe's number of the third lens. 
 
     
     
       7. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
   | R 41/ R 42|>1, 
 wherein R41 denotes a curvature radius of an object side surface of the fourth lens, and 
 R42 denotes a curvature radius of an image side surface of the fourth lens. 
 
     
     
       8. The photographing lens of  claim 1 , wherein the fifth lens comprises an object side surface convex toward the object side around an optical axis and the image side surface concave from the image side around the optical axis. 
     
     
       9. The photographing lens of  claim 8 , wherein the image side surface of the fifth lens comprises at least one inflection point. 
     
     
       10. The photographing lens of  claim 1 , wherein each of the first through fifth lenses comprises at least one aspheric surface. 
     
     
       11. The photographing lens of  claim 1 , wherein the first through fifth lenses are plastic lenses. 
     
     
       12. The photographing lens of  claim 1 , wherein the photographing lens satisfies:
   IND- L 3>1.6 
     Vd - L 3<30, 
 wherein IND-L3 denotes a refractive index of the third lens, and 
 Vd-L3 denotes an Abbe's number of the third lens. 
 
     
     
       13. The photographing lens of  claim 1 , wherein the first lens is meniscus shaped and is convex toward the object side or concave toward the image side. 
     
     
       14. A photographing apparatus comprising:
 a photographing lens; and 
 an image sensor for receiving an image formed by the photographing lens and converting the image into electrical image signals, 
 wherein the photographing lens comprises:
 a first lens having a positive refractive power or a negative refractive power and comprising a meniscus shape, 
 a second lens having a positive refractive power and being a meniscus lens which has an image side surface convex toward an image side, 
 a third lens having a negative refractive power, 
 a fourth lens having a positive refractive power and having a surface convex toward the image side, the fourth lens being a biconvex lens, and 
 a fifth lens having a negative refractive power, having a surface concave away from the image side, and including at least one aspheric surface, 
 wherein the first through fifth lenses are sequentially arranged from an object side toward the image side, and 
 
 wherein the photographing lens satisfies:
   1.332 mm≤EFL≤1.777 mm
 
   3.0 mm≤APE- L 5-MAX<4.5 mm
 
   80 degrees<FoV<160 degree 
   1.0<EFL/EPD<2.0 
   IND- L 5>1.6 
     Vd - L 5<30, 
 
 wherein IND-L5 denotes a refractive index of the fifth lens and Vd-L5 denotes an Abbe's number of the fifth lens, APE-L5-MAX denotes a diameter of a maximum effective aperture of the fifth lens, FoV denotes a field of view of the photographing lens, EFL denotes an effective focal length of the photographing lens, and EPD denotes a diameter of an entrance pupil of the photographing lens. 
 
     
     
       15. The photographing apparatus of  claim 14 , further comprising an iris arranged between the first lens and the third lens. 
     
     
       16. The photographing apparatus of  claim 14 , wherein the fifth lens comprises an object side surface convex toward the object side around an optical axis and the image side surface concave from the image side around the optical axis. 
     
     
       17. The photographing apparatus of  claim 16 , wherein the image side surface of the fifth lens comprises at least one inflection point. 
     
     
       18. The photographing apparatus of  claim 14 , wherein each of the first through fifth lenses comprises at least one aspheric surface. 
     
     
       19. The photographing apparatus of  claim 14 , wherein the first through fifth lenses are plastic lenses.